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Bone Joint J. 2013 Sep;95-B(9):1192-6. doi: 10.1302/0301-620X.95B9.31503.

Femoral head deformity and severity of acetabular dysplasia of the hip.

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  • 1Nagasaki Prefectural Center of Medicine and Welfare for Children, Department of Orthopaedic Surgery, 24-3 Eishohigashi, Isahaya 854-0071, Japan.


Patients with acetabular dysplasia commonly undergo peri-acetabular osteotomy after skeletal maturity to reduce the risk of the late development of osteoarthritis. Several studies have suggested that deformity of the femoral head influences the long-term outcome. We radiologically examined 224 hips in 112 patients with acetabular dysplasia and early-stage osteoarthritis. There were 103 women and nine men with a mean age of 37.6 years (18 to 49). A total of 201 hips were placed in the acetabular dysplasia group and 23 in a normal group. The centre-edge angle and acetabular head index were significantly smaller (both p < 0.001), and the acetabular angle, acetabular roof angle and roundness index were significantly greater in the acetabular dysplasia group than those in the normal group (all p < 0.001). There were significant correlations between the roundness index and other parameters. Femoral head shape may be influenced by the severity of the acetabular dysplasia.


Acetabular dysplasia; Deformity; Femoral head; Hip; Osteoarthritis; Severity

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